To confirm the problem is coming from your card you need to test it in another computer, and test another card in place of yours as well (cross testing).
If your card also isn't working in another computer and another card is working in yours then yeah the problem is coming from your card.
In that case you might try to flash the bios of the card again, either by booting with your card plugged in alongside another working card and use nvflash to flash your card, or use an external USB flasher (cost around 15$, look for keeyees usb flasher on ebay or amazon or such websites).
If that still fails, remove the card cooler, check for any damage or burnt component, oxydation on pci express pins... Clean the card with isopropyl alcohol and a toothbrush. Reapply thermal paste and try again.
If nothing works then it's a hardware problem. In that case if you have some electronical knowledge you can go on youtube, search for "1080 ti repair", there are a lot of good videos of people explaining how to do a hardware diagnostic of a dead card using a multimeter. If you can't do it yourself you can try to contact one of these video makers, one of them might offer to do it with your card.
If it's a dead component on your card, you can replace it, if it's the GPU then as last resort you can try to heat it with a heatgun to reflow the solder, but even if it works it's usually not a permanent solution and your card might still fail afterward.
I suggest you do the tests quickly, before the 3080ti gets out (release date is planed to be 2nd or 3rd june). If it's a hardware problem then buy a 3080 Ti at release day if you can, otherwise you'll have troubles getting a new card.
Good luck!
post edited by Neutro - 2021/05/23 06:18:36